Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c8d8beea0383e47c9d65d45f0ca95626ec435fcd
Commit: c8d8beea0383e47c9d65d45f0ca95626ec435fcd
Parent: 247e020ee5e2a7bf46f2d7a3d4490a670a712a40
Author: Joachim Fenkes <[EMAIL PROTECTED]>
AuthorDate: Thu Sep 13 18:15:28 2007 +0200
Committer: Roland Dreier <[EMAIL PROTECTED]>
CommitDate: Tue Oct 9 19:59:13 2007 -0700
IB/umem: Add hugetlb flag to struct ib_umem
During ib_umem_get(), determine whether all pages from the memory
region are hugetlb pages and report this in the "hugetlb" member.
Low-level drivers can use this information if they need it.
Signed-off-by: Joachim Fenkes <[EMAIL PROTECTED]>
Signed-off-by: Roland Dreier <[EMAIL PROTECTED]>
---
drivers/infiniband/core/umem.c | 20 +++++++++++++++++++-
include/rdma/ib_umem.h | 1 +
2 files changed, 20 insertions(+), 1 deletions(-)
diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
index 664d2fa..2f54e29 100644
--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -37,6 +37,7 @@
#include <linux/mm.h>
#include <linux/dma-mapping.h>
#include <linux/sched.h>
+#include <linux/hugetlb.h>
#include "uverbs.h"
@@ -75,6 +76,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context,
unsigned long addr,
{
struct ib_umem *umem;
struct page **page_list;
+ struct vm_area_struct **vma_list;
struct ib_umem_chunk *chunk;
unsigned long locked;
unsigned long lock_limit;
@@ -104,6 +106,9 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context,
unsigned long addr,
*/
umem->writable = !!(access & ~IB_ACCESS_REMOTE_READ);
+ /* We assume the memory is from hugetlb until proved otherwise */
+ umem->hugetlb = 1;
+
INIT_LIST_HEAD(&umem->chunk_list);
page_list = (struct page **) __get_free_page(GFP_KERNEL);
@@ -112,6 +117,14 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context,
unsigned long addr,
return ERR_PTR(-ENOMEM);
}
+ /*
+ * if we can't alloc the vma_list, it's not so bad;
+ * just assume the memory is not hugetlb memory
+ */
+ vma_list = (struct vm_area_struct **) __get_free_page(GFP_KERNEL);
+ if (!vma_list)
+ umem->hugetlb = 0;
+
npages = PAGE_ALIGN(size + umem->offset) >> PAGE_SHIFT;
down_write(¤t->mm->mmap_sem);
@@ -131,7 +144,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context,
unsigned long addr,
ret = get_user_pages(current, current->mm, cur_base,
min_t(int, npages,
PAGE_SIZE / sizeof (struct page *)),
- 1, !umem->writable, page_list, NULL);
+ 1, !umem->writable, page_list, vma_list);
if (ret < 0)
goto out;
@@ -152,6 +165,9 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context,
unsigned long addr,
chunk->nents = min_t(int, ret, IB_UMEM_MAX_PAGE_CHUNK);
for (i = 0; i < chunk->nents; ++i) {
+ if (vma_list &&
+ !is_vm_hugetlb_page(vma_list[i + off]))
+ umem->hugetlb = 0;
chunk->page_list[i].page = page_list[i + off];
chunk->page_list[i].offset = 0;
chunk->page_list[i].length = PAGE_SIZE;
@@ -186,6 +202,8 @@ out:
current->mm->locked_vm = locked;
up_write(¤t->mm->mmap_sem);
+ if (vma_list)
+ free_page((unsigned long) vma_list);
free_page((unsigned long) page_list);
return ret < 0 ? ERR_PTR(ret) : umem;
diff --git a/include/rdma/ib_umem.h b/include/rdma/ib_umem.h
index c533d6c..2229842 100644
--- a/include/rdma/ib_umem.h
+++ b/include/rdma/ib_umem.h
@@ -45,6 +45,7 @@ struct ib_umem {
int offset;
int page_size;
int writable;
+ int hugetlb;
struct list_head chunk_list;
struct work_struct work;
struct mm_struct *mm;
-
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